THE VELIGER The Veliger 50(l):24-26 (March 11, 2008) © CMS, Inc., 2007 Earliest Record of the Genus Haliotis (Mollusca: Gastropoda) from the Late Cretaceous (Campanian) of Los Angeles County, California LINDSEY T. GROVES Natural History Museum of Los Angeles County, Malacology Section, 900 Exposition Boulevard, Los Angeles, CA 90007 (e-mail: [email protected]) JOHN M. ALDERSON Natural History Museum of Los Angeles County, Invertebrate Paleontology Section, Research Associate, 900 Exposition Boulevard, Los Angeles, CA 90007 (e-mail: [email protected])

Abstract. Cretaceous abalone are extremely rare and are known from only two valid species: Haliotis lomaensis Anderson, 1902, from the Late Cretaceous (latest Campanian/earliest Maastrichtian) of San Diego County, California and H. antillesensis Sohl, 1992, from the Late Cretaceous (late Maastrichtian) of southwestern Puerto Rico. The earliest record of the genus Haliotis is here documented from Late Cretaceous (middle middle to late middle Campanian) strata of the Tuna Canyon Formation, Garapito Creek area of Topanga Canyon, Santa Monica Mountains, Los Angeles County, California. This additional Cretaceous record for Haliotis could possibly indicate a North American origin for the family Haliotidae. INTRODUCTION MATERIAL Cretaceous abalone species are extremely rare, current- A single poorly preserved internal mold with little ly comprising only two valid species (Sohl, 1992; Geiger remaining original or recrystallized shell material, & Groves, 1999; Geiger, 2000). These species include: Natural History Museum of Los Angeles County, Haliotis lomaensis Anderson, 1902 from the Late Invertebrate Paleontology (LACMIP) hypotype 13237 Cretaceous (latest Campanian/earliest Maastrichtian) (Figs. 1-4) from LACMIP loc. 27110 (ex University of Point Loma Formation, San Diego County, California California, Los Angeles loc. 7110) that measures and H. antillesensis Sohl, 1992 from the Late Creta- 5.9 mm in overall length retains several diagnostic ceous (late Maastrichtian) El Rayo Formation, Sabana features that validate it as a haliotid. Observed features Grande quadrangle, southwest Puerto Rico. Suspect include a flattened "shell" with low spire, wide records of Cretaceous abalone that have been relegated columella, and a row of six tremata toward the left to pleurotomarioidean genera include Haleotis? [m] periphery. Because of such poor preservation we antiqua Binkhorst, 1861 [= Trochus limburgensis hesitate to describe a new species based on this sole Kaunhowen, 1897] from the Maastrichtian near example. Nevertheless, due to the uniqueness of this Maastricht, Limburg Province, the Netherlands, Pleur- specimen from Late Cretaceous (middle middle to late otomaria antiqua (Binkhorst, 1861) of Weinzettl (1910) middle Campanian) strata, it is noteworthy enough to from the Late Cretaceous (Cenomanian) near Kor- mention as the earliest known worldwide representative ycany, Czech Republic, and Haliotis cretacea Lundg- of the genus Haliotis. ren, 1894 [= Pleurotomaria sp.?] from the Late Cretaceous (Campanian) near Barnakallegrottan, LOCALITY southeastern Sweden [see Sohl (1992) for additional LACMIP loc. 27110 is on the north side of Garapito details], A poorly preserved specimen identified as Creek just above the 1300 ft. contour line, 900 ft. Haliotis sp. by Dawson (1978) and reported by north, 735 ft. east of SW corner of section 33 Sundberg (1979, 1984) from the Late Cretaceous (projected), TIN, R16W San Vicente y Santa Monica (Maastrichtian) Cabrillo Formation of San Diego Land Grant, northeast of Sylvia Park, United States County, California is actually a specimen of the Geological Survey (USGS) Topanga quadrangle (1976 calyptraeid genus Lysis (L.R. Saul, personal commu- ed.), Santa Monica Mountains, Los Angeles County, nication). California. L. T. Groves & J. M. Alderson, 2007 Page 25

models as follows: 1) An "Indo-Pacific" model, also discussed by Lindberg (1992), indicates that living abalone are most diverse in the central Indo-Pacific, which implied that this was their center of radiation; 2) A "Pacific Rim" model proposed by Talmadge (1963), where abalones originated on an island arc from Japan to northern Australia and radiated to California, southern Australia, and the Indo-Pacific; and 3) A "chromosomal" model where species with a low diploid number (28) live in the eastern Mediterranean Sea and species with higher diploid numbers (32) in the Indo-Pacific and (36) in the North Pacific, abalones dispersed eastward from the Mediterranean. However, Figures 1-4. Haliotis sp., hypotype LACMIP 13237, from because these models do not consider the fossil record LACMIP loc. 27110, 1 = dorsal view (X7.6), 2 = oblique view they could be rejected. Moreover, this confirmation of (X10), 3 = lateral view (X9.3), 4 = columellar view (X10.3). the earliest known haliotid from Late Cretaceous (middle middle to late middle Campanian) strata of STRATIGRAPHY & AGE southern California combined with the fact that The specimen was collected by the junior author on 21 Cretaceous abalones are known exclusively from North December, 1983 from the base of informal "member D" America further strengthens the possibility of a North of Wilson (1941) [= map unit Ktd of Yerkes et al. American origin for the family Haliotidae. Kiel & (1994)] within the Late Cretaceous (late middle to early Bandel (2000) described Temnotropis frydai (Family late Campanian), Metaplacenticeras pacificum ammon- Temnotropidae) from the Late Creatceous (late Cam- ite zone [33N chron] (Elder & Saul, 1996) part of the panian) Valcarga Formation near Torallola, Lerida Tuna Canyon Formation of Yerkes & Campbell (1979) Province, Catalona Region, northeastern Spain and [= Unnamed strata of Dibblee, 1992]. This ammonite speculated that Temnotropis is a likely ancestor of zone was cited as Late Cretaceous (middle middle to Haliotis. Temnotropis has a Haliotis-YikQ shell with a slit late middle Campanian) [C33 chron] by Squires & Saul rather than a row of tremata. With a possible ancestor (2003) and we follow this usage. "Member D" is a in Spain, the haliotids may have originated in the fossiliferous fine-grained sandstone that occurs imme- eastern Atlantic (S. Kiel, personal communication, diately above a thick, cobble conglomerate informally 2007). However, should a haliotid be found in strata designated as "member C" by Wilson (1941) [= map older than middle middle to late middle Campanian a unit Ktc of Yerkes et al. (1994)] and is equivalent to the reevaluation of their origin will be necessary. lowermost part of a fine-grained sandstone reported by Acknowledgments. We express our thanks to our colleagues Popenoe (1954). LACMIP loc. 27110 is within an Richard L. Squires (California State University, Northridge, unusual small lens of "member D" that disappears Geological Sciences), LouElla R. Saul (LACMIP), and Angel along strike within 100 ft. (33 m). Unfortunately, Valdes (LACM Malacology) for reviewing the manuscript and Dibblee (1992) incorrectly mapped this lens of "member adding valuable suggestions. Daniel L. Geiger (Santa Barbara D" as Paleocene Santa Susana Formation as did Yerkes Museum of Natural History) is acknowledged for examining et al. (1994). However, recent field work by the junior the specimen, confirming the identification, and reviewing the manuscript. His unsurpassed knowledge of abalone morphol- author combined with the fauna listed below, correctly ogy and phylogenetics is greatly appreciated. Many thanks to place the locality within the Tuna Canyon Formation. Steffen Kiel (University of Leeds, Leeds, England, UK) for his In addition to the ammonite Metaplacenticeras thoughtful review of the manuscript and valuable insights. pacificum (Smith, 1900), LACMIP 27110 also yielded LouElla R. Saul identified additional mollusks from LACMIP the ammonite Baculites cf. B. inornatus Meek, 1862, the loc. 27110. Special thanks to N. Scott Rugh (San Diego Natural History Museum) for the loan of Dawson's (1978) gastropods Atira sp., Turritella chicoensis pescaderoen- Haliotis sp. Angel Valdes is also thanked for assisting with sis Arnold, 1908, Gyrodes pacificum Popenoe & others, digital photography. Many thanks to Cathy L. Groves 1987, Volutoderma n. sp., and Biplica obliqua (Gabb, (LACM Echinoderms Section) for assistance with digital 1864), and the bivalves Pterotrigonia evansana (Meek, image manipulations. 1858), Glycymeris veatchii (Gabb, 1864), mytilid sp., Ostrea sp., and Calva sp. LITERATURE CITED ANDERSON, F. M. 1902. Cretaceous deposits of the Pacific PALEOBIOGEOGRAPHY Coast. Proceedings of the California Academy of Sciences, 3rd ser., Geology 2(1): 1-154, pis. 1-12. Geiger & Groves (1999), Geiger (2000), and Geiger & ARNOLD, R. 1908. Descriptions of new Cretaceous and Poppe (2000) discussed three possible haliotid radiation Tertiary fossils from the Santa Cruz Mountains, Califor- Page 26 The Veliger, Vol. 50, No. 1

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